Newts' ability to regenerate tissue replicated in mouse cells

Tissue regeneration a la salamanders and newts seems like it should be the stuff of science fiction. But it happens routinely. Why can't we mammals just re-grow a limb or churn out a few new heart muscle cells as needed? New research suggests there might be a very good reason: Restricting our cells' ability to pop in and out of the cell cycle at will -- a prerequisite for the cell division necessary to make new tissue -- reduces the chances that they'll run amok and form potentially deadly cancers.

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